例外“您指定的Content-MD5与我们收到的不匹配". [英] An exception "The Content-MD5 you specified did not match what we received"

问题描述

我遇到一个例外，在测试将文件从ec2上传到s3的应用程序时，我从未有过.内容是:

I got an exception, I never got before when testing my application that uploads a file from ec2 to s3. The content is:

Exception in thread "Thread-1" com.amazonaws.services.s3.model.AmazonS3Exception: The Content-MD5 you specified did not match what we received. (Service: Amazon S3; Status Code: 400; Error Code: BadDigest; Request ID: 972CB8E04388AB20), S3 Extended Request ID: T7bmFnQ2RlGWlJD+aGYfTy97XZw88pbQrwNB8YCezSjyq6O2joxHRP/6ko+Q2zZeGewkw4x/90k=
    at com.amazonaws.http.AmazonHttpClient.handleErrorResponse(AmazonHttpClient.java:1383)
    at com.amazonaws.http.AmazonHttpClient.executeOneRequest(AmazonHttpClient.java:902)
    at com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:607)
    at com.amazonaws.http.AmazonHttpClient.doExecute(AmazonHttpClient.java:376)
    at com.amazonaws.http.AmazonHttpClient.executeWithTimer(AmazonHttpClient.java:338)
    at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:287)
    at com.amazonaws.services.s3.AmazonS3Client.invoke(AmazonS3Client.java:3676)
    at com.amazonaws.services.s3.AmazonS3Client.putObject(AmazonS3Client.java:1439)
    at com.amazonaws.services.s3.transfer.internal.UploadCallable.uploadInOneChunk(UploadCallable.java:131)
    at com.amazonaws.services.s3.transfer.internal.UploadCallable.call(UploadCallable.java:123)
    at com.amazonaws.services.s3.transfer.internal.UploadMonitor.call(UploadMonitor.java:139)
    at com.amazonaws.services.s3.transfer.internal.UploadMonitor.call(UploadMonitor.java:47)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

该如何解决此错误?我在应用程序中使用了与以前相同的代码.

What can I do to fix this bug? I used the same code as before in my application.

推荐答案

我认为我已经解决了我的问题.我终于发现我的某些文件在上传过程中实际上发生了变化.由于文件是由另一个线程生成的，因此上传和生成是同时完成的.该文件无法立即生成，并且在生成文件的过程中，它可能是同时上传的，而该文件实际上是在上传过程中更改的.

I think I have solved my problem. I finally found that some of my files actually changed during the uploading. Because the file is generated by another thread, the uploading and generating is done at the same time. The file can not be generated immediately, and during the generating of a file, it may be uploading at the same time, the file actually changed during the uploading.

文件的md5是在AmazonS3Client上传开始时创建的，然后将整个文件上传到S3，此时，该文件与开始时上传的文件不同，因此md5实际上已更改.我将程序修改为单线程程序，该问题再也没有出现.

The md5 of file is created at the beginning of uploading by the AmazonS3Client, then the whole file is uploaded to the S3, at this time, the file is different from the file uploaded at beginning, so the md5 actually changed. I modified my program to a single-threading program, and the problem never turned up again.

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